Reinforced concrete floor construction



w. N. MURCH 2,110,110

March 1, 1938.

REINFORCED CONCRETE FLOOR CONSTRUCTION 2 Sheets Sheet 1 Filed March 26,1956 H45 677- 7'0 QNE Ki March 1 1938. W R H 2,110,110

REINFORCED CONCRETE FLOOR CONSTRUCTION Filed March 26, 1956' 2Sheets-Sheet 2 4 4 a 7. f; y [iz 3 3 3 1 v /7 /5 1/15 flrrae/vEYs.

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Patented Mar. 1, 1938 ATET FFlCE REINFORCED CONCRETE FLOOR CON-STRUCTION Application March 26,

5 Claims.

My invention relates to reinforced concrete floors. Its principal objectis to devise a reinforced concrete fioor construction which can be madewithout using centering or temporary supports. Another object is todevise a reinforced concrete floor constructionthat will be light andstrong and economical of labor and material. The invention consists inthe arrangements and combinations of parts hereinafter described andclaimed.

In the accompanying drawings, which form part of this specification andwherein like reference numerals refer to like parts wherever they occur,

Fig. 1 is a top plan view of the metal trusses, hollow tile and spacingmembers of a hollow floor construction embodying my invention,

Fig.2 is a side elevation looking in the direction of the arrows 2-2 inFig. 1,

Fig. 3 is a sectional view on the line 3-3 in Fig. 1,

Fig. 4 is a sectional view on the line 4-4 in Fig. 1,

Fig. 5 is a sectional View on the line 5-5 in Fig. 4,

Fig. 6 is an elevation of a portion of one of the spacer members,

Fig. 7 is a sectional view at one of the metal truss members of Fig. 3showing the poured concrete in place,

Fig. 8 is a sectional view similar to Fig. 4, showing the pouredconcrete,

Fig. 9 is a sectional view showing the invention as applied to a metalbeam or grider,

Fig. 10 is a sectional View of a modification in "which the metaltrusses have their upper chords resting on the tops of metal I-beams,

Fig.,1l is a partial sectional view similar to Fig. '7, showing anailing strip for a wood floor applied to the upper chord of the metaltruss, and

Fig. 12 is a sectional view showing a modified form of tile.

According to the present invention, a series of metal trusses I aresupported at their ends on walls 2 or girders. A truss suitable for thepresent construction consists of an I-beam slitted and expanded so as tospread apart the top flange 3 and bottom flange 4 andstill leave themintegral- 1y connected by tie members 5. Such expanded beams or girdersare well known structural elements.

The trusses are strong and rigid enough to support, without deflection,their own weight plus the weight of the hollow tiles 6, and Wet concrete1936, Serial No. 70,922

I hereinafter mentioned. The lower chords of the trusses are wider thanthe lattice portion thereof and their margins form ledges on which theends of hollow tiles 6 are supported. The lower chords are wide enoughto leave the proper space 5 for pouring concrete ribs above them andbetween the ends of the tiles supported on opposite sides thereof.

In a typical construction, the trusses are arranged parallel with eachother and are spaced apart by means of suitable spacing members 8 suchas are shown for example, in Fig. 6. The spacing members there shownhave recesses 9 in the underside adapted to receive the lower chords ofthe trusses and thereby enable the main stretches of such spacingmembers to be positioned with the upper surfaces of their marginalportions substantially flush with the upper surfaces of the marginalportions of the lower chords of the trusses. Preferably, the spacing{members are formed with upstanding flanges It! for the purpose ofstiffening them, said flanges being located inwardly from the sidesthereof, leaving the marginal portions to constitute ledges forsupporting the sides of the tiles 6. By this arrangement, the spacingmembers function as struts or distance pieces to keep adjacent trussesspread apart, as tie members to keep said trusses from spreading too farpart, and as supporting members for the adjacent tiles. 30

In the construction illustrated, the hollow tiles 6 are supported on thelower chords of the trusses, the individual tile being of such length asto reach from truss to truss but short enough to leave ample spacesbetween its end wall and the end wall of the tile supported on theopposite margins of the truss for the formation of a reinforced concretebeam ll. Those tiles that are next to the spacing members have one edgeresting on the ledges thereof, the tiles on opposite sides of thespacing member being arranged sufficiently far enough apart to providefor the formation of a concrete rib l2 extending from truss to truss.

Prefer-ably the hollow tiles are of less depth than the distance betweenthe upper and lower chords of the trusses. The spaces between ends ofthe tiles on opposite sides of the trusses and the spaces above thespacing members are filled with concrete which is extended upwardly farenough to embed the upper chords of the trusses and cover the tops ofthe tiles in a continuous slab. V In the operation of pouring theconcrete, the lower chords of the trusses and the spacing membersfunction as the bottoms of the form-work for the beamsv or ribs, and thevertical sides of the tiles function as the side members of the formworkfor such beams or ribs, while the tops of the tiles function as theform-Work for the portion of the slab above said tiles.

In Fig. 12 is shown a modified form of tile which has an angular recess30 extending along the lower edge of one side wall, a recess 3| near thebottom of the outer side wall and a projecting lower lip forming thelower wall of said recess. The angular recess 30 permits one edgeportion of said tile to rest on the lower chord of the truss and thechord of the truss at the other side of said tile is received in therecess 3 I, the lip crete beams I I.

V fireproofing the same.

32 lying against the under side of the bottom chord of the truss andextending into proximity with the next tile. When tiles of this shapeare used, the bottom of the lower chords of the trusses are protected bythe projecting lips 32, so that only a finishing coating of plaster isrequired.

In the finished construction, all but the lower chords of the trussesare embedded in the concrete and form therewith strong reinforced con-All of the unembedded metal is in the region of tension where theconcrete is of little importance in taking care of beam stresses,

while the lattice portion and all the metal in the compression regionare fully embedded in the concrete and act conjointly therewith. In thefinished construction, the hollow tiles function to lighten, strengthenand stiffen the reinforced concrete construction, assist in supportingthe slab between trusses and furnish a good base for a plaster ceiling.

It is noted as an important advantage of my construction that itdispenses with all temporary form-work or centering, as the lower chordsof the trusses, the spacing members and the hollow tiles, which performthe functions of centering, are all permanent and effective elements ofmy finished construction.

The construction hereinbefore described is capable of considerablemodification without departing from'my invention. For instance, insteadof using a single truss for each reinforced concrete beam or girder, twoor more trusses may be disposed side by side with their lower chordsabutting, or with such chords spaced apart and the space closed with aclosure strip to prevent leakage of the concrete. In such case, thetiles rest on the outer margins of the outermost trusses.

Again, instead of having the lower chords of the trusses resting onwalls, as hereinbefore described, it is feasible to suspend said trussesby placing the ends of the top chords thereof on the walls or on thetopflanges of metal girders M, as illustrated in Fig. 10. In case metalgirders are used, it is desirable to entirely embed the lower portionthereof in concrete for the purpose of In such case, a troughshapedform-work i5 is suspended from the trusses below and on opposite sidesof the metal girder by means of bolts I6 or the like, sufficient spacebeing left between the metal girder and the sides of the adjacent tilesto permit the concrete to be poured on both sides and at the bottom thatare riveted or welded to the top and bottom chords.

What I claim is:

1. A reinforced concrete floor construction comprising supports,openwork metal trusses mounted on said supports, hollow tiles mountedlying the bottoms of the lower chords of said trusses, and concreteembedding all portions of the trusses above the lower chords thereofsaid trusses being strong and rigid enough to support, withoutsubstantial deflection, their own weight plus the weight of the hollowtiles and wet concrete, whereby temporary centering may be dispensedwith in the building of said construction.

2. A reinforced concrete floor construction comprising supports,openwork metal trusses mounted on said supports, metal spacer membersfor said trusses, said spacer members being recessed to receive thelower chords of said trusses and having their main stretches flush withthe tops of said lower chords, hollow tiles mounted on the lower chordsof said trusses with spaces between them and the lattice portions ofsaid trusses, there being a space between tiles at said spacer memberswith the tiles on either side of said spacer members resting thereon andconcrete covering said tiles, filling the spaces defined by said spacermembers and the tiles on either side thereof and embedding all portionsof said trusses above the lower chords thereof.

3. A reinforced concrete floor construction comprising supports,openwork metal trusses mounted on said supports, metal spacer membersfor said trusses, said spacer members being recessed to receive thelower chords of said trusses and having their main stretches flush withsaid lower chords and having longitudinal stiffening flanges on theirtops, hollow tiles mounted on the lower chords 'of said trusses withspaces between them and the lattice portions of said trusses, therebeing a space between tiles at said spacer members with the tiles oneither side of said spacer members resting thereon spaced from thestiffening flanges of said spacer members and concrete thereof andembedding all portions of said trusses above the lower chords thereof.

4. A reinforced concrete floor construction comprising supports,openwork metal trusses mounted on said supports, hollow tiles mounteddirectly on the lower chords of said trusses with spaces between themand the lattice portions of said trusses, and concrete in a continuousmass covering said tiles and embedding all portions of the trusses abovethe lower chords thereof, the tops of said tiles being lower than the.tops of said metal trusses and the bottomsof said tiles beingsubstantially flush with the lower chords of said trusses, said trussesbeing strong and rigid enough to support, without substantialdeflection, their own weight plus the weight of the hollow tiles and wetconcrete, whereby temporary centering may be dispensed with in thebuilding of said construction and all the concrete poured in oneoperation.

5. A reinforced concrete floor construction comprising supports,openwork metal trusses mounted on said supports, metal spacer membersfor said trusses, said spacer members having flanges flush with thelower chords of said trusses, hollow tiles mounted on the lower chordsof said trusses with spaces between them and the lattice portions ofsaid trusses, there being a space between tiles at said spacer memberswith the tiles on either side ofsaid spacer members resting on theflanges thereof, and concrete in a continuous mass covering said tilesand filling the spaces defined by said spacer members and the tiles oneither side thereof and embedding all portions of said trusses above thelower chords thereof.

WILLIAM N. MURCH.

